SHIMANO Di2 battery charger SM-BCR2 — Internal BTR USB 2.0, Black compact

The Shimano Dura‑Ace SM‑BCR2 is a compact USB‑powered charger designed to recharge internal Di2 batteries quickly and reliably for Shimano electronic shifting systems.

If you ride a bike equipped with Shimano Di2 electronic shifting that uses an internal BTR‑type battery, the SM‑BCR2 provides a simple USB 2.0 charging interface to keep your system ready for every ride. Built to the same standards as Shimano's Dura‑Ace lineup, this charger focuses on dependable connection, clean charging without extra cables included, and compatibility with Shimano's internal battery units.

How do I use the SM‑BCR2 to recharge my Di2 battery?

Charging with the SM‑BCR2 is straightforward: connect the charger to a USB 2.0 power source and attach it to the bike's Di2 charging port or battery connector. The unit charges the internal battery safely and indicates charging status through your Di2 system or the connected power source.

• Connect to any standard USB 2.0 port or USB charger adapter.
• Attach to the bike’s Di2 internal battery connector securely.
• Charge time varies by battery model; monitor Di2 indicators for completion.

Which Shimano batteries and Di2 systems are compatible?

The SM‑BCR2 is made for Shimano Non‑Series Di2 setups that use internal BTR‑style batteries (such as BTR2). It pairs with many Dura‑Ace and Ultegra Di2 systems where an internal battery is present, but always confirm compatibility with your bike manufacturer or Shimano documentation.

• Designed for internal BTR‑type Di2 batteries (for example BTR2).
• Works across compatible Dura‑Ace and Ultegra Di2 installations.
• Not intended for external battery chargers or incompatible Di2 generations.

What safety or convenience features should I expect?

Shimano built the SM‑BCR2 to provide a dependable, low-maintenance charging option: the USB 2.0 interface makes it easy to find a power source at home, at work, or on the road. The charger omits extra cables, so it's compact for storage and travel; pairing with a quality USB power adapter is recommended for optimal charging performance.

• Compact black housing for discreet, lightweight storage.
• USB 2.0 compatibility for broad power source options.
• No cable included—use your preferred USB lead and adapter.

How long does a full charge take and how should I maintain it?

Charging duration depends on the battery capacity and the power source you use; typical internal Di2 batteries reach full charge in a few hours when using a suitable USB adapter. For longevity, avoid extreme temperatures and store the charger dry when not in use.

• Charge time varies by battery model and USB adapter output.
• Avoid charging in wet or extremely hot/cold conditions.
• Keep the charger clean and disconnect when charging finishes.

Who is this for: The Shimano Dura‑Ace SM‑BCR2 charger is aimed at cyclists who own bikes with Shimano internal Di2 batteries and want a compact, reliable USB charging solution. It's ideal for road racers, avid commuters, and workshop technicians who need a simple charger to maintain electronic shifting readiness without carrying bulky charging hardware.